Sylvain Danto

Sylvain Danto
University of Bordeaux · Department of Science and Technology

PhD

About

91
Publications
17,295
Reads
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1,993
Citations
Citations since 2016
41 Research Items
1469 Citations
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
2016201720182019202020212022050100150200
Additional affiliations
September 2013 - November 2015
University of Bordeaux
Position
  • Researcher
September 2013 - November 2015
University of Bordeaux
Position
  • Researcher
May 2011 - July 2013
Clemson University
Position
  • Researcher

Publications

Publications (91)
Article
Full-text available
Here we present the ability of Nd ³⁺ -doped zinc-phosphate glasses to be shaped into rectangular core fibers. At first, the physico-chemical properties of the developed P 2 O 5 -based materials are investigated for different concentrations of neodymium oxide and core and cladding glass compositions are selected for further fiber development. A modi...
Article
Here we explore the manufacturing of niobium-rich borophosphate glasses into fibers with optical quality. Glass preforms of composition [(100-x) (0.95 NaPO3 + 0.05 Na2B4O7) - x Nb2O5] with x = 37, 38, 39, 40 were synthetized and thermally drawn. Viscosity measurements performed in the softening point range show that the optical fiber drawing temper...
Article
New Yb³⁺-doped phosphate glasses with a composition of (98.75-x) (90 NaPO3 – 10 Na2O) – x (Al2O3, TiO2, or ZnO) – 1.25 Yb2O3 (in mol-%), with x from 0 to 3, were prepared via conventional melting and quenching process. The thermal and physical properties were studied by differential thermal analysis (DTA) and density measurement, respectively. The...
Article
A series of new transparent and magnetic barium gallogermanate glasses in the system (x) Gd2O3 – (100-x) [20BaO−15Ga2O3−65GeO2] with x = 0, 8, 14, 18, 22 and 25 mol% were synthesized. Their thermal, structural and magnetic properties were characterized. Based on the differential scanning calorimetry results, one determined the composition domain ex...
Article
Full-text available
The radiation effects of electrons and protons on the spectroscopic and optical properties of oxide glasses doped with Yb 3+ in various glass systems were investigated to understand the impact of the glass composition on the glass photo-response. Changes in the optical and emission properties were seen after the radiation treatment, and the magnitu...
Article
Full-text available
We report on the synthesis of transparent amorphous hydrated phosphate materials at low temperatures (as low as 300 °C) in the [50 P2O5 – (25 - x/2) K2O – (25 - x/2) Na2O – x ZnO] – n H2O (x = 0 – 25 mol%). These new transparent materials were studied by Raman and FTIR spectroscopies. The structure of the hydrated phosphates is proposed to consist...
Article
Here we report on the effect of potassium or yttrium on the luminescence spectroscopic properties of Yb³⁺-doped germano-gallate glasses as well as the ability to shape them into optical fibers with the objective of using such glasses to produce near-infrared optical gain medium. Two ytterbium-doped germano-gallate glass systems, (100-x) (28Ga2O3 –...
Article
In this work, 0%, 0.5%, 1%, and 2% Cu-doped WO3 nanoparticles were synthesized via a polyol method. The as-synthesized materials were characterized by x-ray diffraction, scanning electron microscopy (SEM), electron paramagnetic resonance (EPR), x-ray photoelectron spectroscopy (XPS), and UV-Vis photochromic activity. A bond valence model was adopte...
Article
Full-text available
Here, it is demonstrated that the stack‐and‐draw approach can be expanded to unusual materials association and profile geometries to generate fiber assemblies with unprecedented functionalities. This approach relies on the stacking of flat oxide glass slides into a preform, which is then thermally elongated into tens‐of‐meters‐long ribbon fibers wi...
Article
Full-text available
The ability to produce robust fiber-based integrated optical systems operating over a wide spectral domain (UV to mid-infrared), is one of today’s key challenges in photonics. This work reports on the production of crystal-free, light guiding fibers from rich Ga2O3 oxide-based glass compositions. These materials show optical transmission extending...
Article
Optical composite fibers based on active transition metal (TM)-doped semiconductor crystals are being investigated for use in mid-infrared (mid-IR) fiber laser systems. This study evaluates a candidate glass matrix system assessing its key physical properties and suitability for optical fiber drawing and examines the stability of TM-doped ZnSe crys...
Article
Full-text available
Transparent fluorotellurite glasses were prepared by melt-quenching in the ternary system TeO2-Nb2O5-PbF2. The synthesis conditions were adjusted to minimize fluorine loss monitored as HF release. It was found that 10 mol% of Nb2O5 is the optimum content for PbF2 incorporation up to 35 mol% in the tellurite matrix without loss of glass forming abil...
Article
We examine the thermal drawing of zinc tellurite silver-containing glass. While the silver-doped glass fibers remain unchanged over thermal drawing under oxygenatmosphere, we establish that under argon silver doping leads to the growth of a thin, metallic-like precipitate at the fiber surface. Optical, chemical and structural analysis, supported by...
Article
Full-text available
Additive manufacturing of oxide glass enables on-demand, low-cost manufacturing of complex optical components for numerous applications, opening new opportunities to explore functionalities inaccessible otherwise. Here, we report a straightforward extrusion-based 3D-printing approach, deploying the fused deposition modeling (FDM) process, to produc...
Article
Full-text available
This review focuses on the radiation-induced changes in germanate and tellurite glasses. These glasses have been of great interest due to their remarkable potential for photonics, in terms of extended transmission window in the mid-infrared, ability of rare-earth loading suitable with a laser, and amplification in the near- and mid-infrared or high...
Article
Full-text available
Experimental development of a compact optical emission detector based on the assembly of a polymer-metal and a standard silica fiber is presented in this paper. This device is exploited in a proof-of-principle experiment for gas detection application by means of plasma spectroscopy in the visible-Near Infrared spectral region. A multimode fiber (MM...
Conference Paper
Using femtosecond laser writing technique, near-surface waveguides with no need for additional processing were written in silver-containing glasses. An ultra-sensitive refractive index sensor exhibiting a novel double-wing feature is manufactured in a 1 cm glass chip.
Article
Properties of the tellurite glasses 80TeO2–10ZnO–[(10−x)Na2O–xAg2O] are investigated as a function of the substitution ratio x between Na2O and Ag2O. One observe that the variation of glass transition temperature decreases monotonously with x and that surface crystallization mechanism is favored. The assignment of the Raman bands and their relation...
Article
Full-text available
The generation of silver species has been investigated in silver containing sodo‐gallo‐phosphate glasses subjected to X‐rays irradiations. Radio‐luminescence spectroscopy has evidenced the presence of isolated and paired silver ions. The proportion of silver pairing is found dominant in ortho‐phosphate glass compositions, compared to poly‐phosphate...
Article
Full-text available
Here we report on the production of crystal-free light guiding fibers using a preform-to-fiber approach in the germano-gallate glass system Ga2O3-GeO2-BaO-La2O3-Y2O3 for various contents of gallium to germanium. For glasses in the system Ga2O3-GeO2-BaO-K2O, where surface crystallization precludes fiber drawing from the preform, an open-crucible tec...
Article
Full-text available
The femtosecond direct laser writing technique in glasses has been widely used and extensively studied during the last two decades. This technique provides a robust and efficient way to directly inscribe embedded 3D photonic devices in bulk glasses. Following direct laser writing, a local refractive index change (∆n) is induced that is generally cl...
Article
Silver-containing glasses are promising candidates for photonic applications, due to the potentiality of spec-troscopic properties of silver nanoclusters (NC's) and/or silver metallic nanoparticles. In this framework, silver-containing fluorophosphate glasses are candidates with a strong potential. Indeed, combined with femtosecond laser irradiatio...
Conference Paper
Direct laser writing (DLW) of 3D embedded waveguides in glasses has been well established this last decade. However, few works of DLW of waveguides neighboring the glass surface were presented due to the ablation problems when getting near the glass surface. Some solutions have been presented like using reinforced glasses or using additional proces...
Presentation
In the two last decades, development of more reliable femtosecond lasers has led to innovative laser/matter processes and key enabling technologies. Mainly applied to silica glass fibers, Direct Laser Writing (DLW) using femtosecond laser has been carried out to perform glass network photostructuration leading to many applications, including lab-in...
Article
Full-text available
Silver containing glasses in the P2O5 - Ga2O3 - Na2O ternary diagram have been investigated to relate the effect of glass network structure and sodium ions concentration to spectroscopic and laser-writing properties of the materials. The first and most striking evidence is the large gain in the photosensitivity of fluorescent molecular silver clust...
Article
Laser-induced glass processing has led to huge progress and applications over the last two decades. Here, we review recent advances in femtosecond laser-induced photochemistry in isotropic transparent oxide glasses specifically tailored with silver photoactive agents. The understanding of the influence of the considered glass matrix on the nature a...
Conference Paper
Direct laser writing in glasses triggers three different type of refractive index changes classified as three types (Type I, II & III). In silver containing glasses, a novel type of refractive index change called type A has been reported allowing the creation of novel type of waveguides. Type I & Type A refractive index changes both could be trigge...
Conference Paper
Direct Laser writing in silver containing phosphate glasses allows fabricating multi-scale photonic structures with various optical contrast (linear and nonlinear). The glass matrix composition determines the resulting photo-induced structures.
Article
Full-text available
Direct laser writing in glasses is a growing field of research in photonics since it provides a robust and efficient way to directly address 3D material structuring. Generally, direct laser writing in glasses induces physical modifications such as refractive index changes that have been classified under three different types (Type I, II & III). In...
Article
Tailored tellurite-glasses possess excellent thermo-viscous ability and linear/nonlinear optical properties. Here, bringing together the merits of these materials with fiber optic technology, we report on the first tellurite-based core-clad dual-electrode composite fiber made by direct, homothetic preform-to-fiber thermal co-drawing. The rheologica...
Article
Tailored silver-containing zinc-phosphate glasses possess excellent thermoviscous ability and optical properties. Beyond they have proven to form a favorable matrix for the direct laser writing of photoluminescent and nonlinear patterns. Here, bringing together the merits of these materials with fiber optic technology, the first photosensitive, pho...
Article
Full-text available
Infrared (IR) fibers offer a versatile approach to guiding and manipulating light in the IR spectrum, which is becoming increasingly more prominent in a variety of scientific disciplines and technological applications. Despite well-established efforts on the fabrication of IR fibers in past decades, a number of remarkable breakthroughs have recentl...
Article
Multicomponent TeO2–Bi2O3–ZnO (TBZ) glass thin films were prepared using RF magnetron sputtering under different oxygen flow rates. The influences of oxygen flow rate on the structural and optical properties of the resulting thin films were investigated. We observed that thin films sputtered in an oxygen-rich environment are optically transparent w...
Chapter
Full-text available
Thermal analysis techniques provide powerful tools for both the fundamental understanding and practical applications of chalcogenide glasses. Differential scanning calorimetry, thermogravimetric, and thermomechanical analysis all provide insight not only into those properties of chalcogenide glasses which are critical for hot-forming applications,...
Chapter
This chapter covers state of the art in physical ageing of chalcogenide glasses. The thermodynamic origin of this phenomenon, experimental possibilities for its investigation, up-to-date results, general phenomenology and observed regularities are critically reviewed. The influence of various external factors, such as elevated temperatures, light e...
Article
Full-text available
Organic polymer materials are widely credited with extreme versatility for thin film device processing. However, they generally lack the high refractive indices of inorganic semiconductors essential for tight optical confinement in planar integrated photonic circuits. Inorganic–organic hybrid photonic systems overcome these limits by combining both...
Article
Full-text available
Photonic integration on plastic substrates enables emerging applications ranging from flexible interconnects to conformal sensors on biological tissues. Such devices are traditionally fabricated using pattern transfer, which is complicated and has limited integration capacity. Here we pioneered a monolithic approach to realize flexible, high-index-...
Article
Full-text available
This paper reports a versatile, roll-to-roll and backend compatible technique for the fabrication of high-index-contrast photonic structures on both silicon and plastic substrates. The fabrication technique combines low-temperature chalcogenide glass film deposition and resist-free single-step thermal nanoimprint to process low-loss (1.6 dB/cm), su...
Conference Paper
A high bandwidth density chip-to-chip optical interconnect architecture is analyzed. The interconnect design leverages our recently developed flexible substrate integration technology to circumvent the optical alignment requirement during packaging. Initial experimental results on fabrication and characterization of the flexible photonic platform a...
Article
Full-text available
Chalcogenide glasses, namely the amorphous compounds containing sulfur, selenium, and/or tellurium, have emerged as a promising material candidate for mid-infrared integrated photonics given their wide optical transparency window, high linear and nonlinear indices, as well as their capacity for monolithic integration on a wide array of substrates....
Article
Full-text available
High-index-contrast optical devices form the backbone of densely integrated photonic circuits. While these devices are traditionally fabricated using lithography and etching, their performance is often limited by defects and sidewall roughness arising from fabrication imperfections. This paper reports a versatile, roll-to-roll and backend compatibl...
Article
Full-text available
In this article, we review our recent work on mid-infrared (mid-IR) photonic materials and devices fabricated on silicon for on-chip sensing applications. Pedestal waveguides based on silicon are demonstrated as broadband mid-IR sensors. Our low-loss mid-IR directional couplers demonstrated in SiN x waveguides are useful in differential sensing ap...
Patent
Full-text available
Photodetecting fiber. The fiber detects and localizes an incident optical beam. A semiconducting core is in intimate contact with a material forming a resistive channel that breaks axial symmetry. The resistive channel has a resistivity between that of metals and the semiconducting core, enabling the imposition of non-uniform, convex electric poten...
Article
Full-text available
Long-wave infrared fibers are used in an increasing number of applications ranging from thermal imaging to bio-sensing. However, the design of optical fiber with low-loss in the far-infrared requires a combination of properties including good rheological characteristics for fiber drawing and low phonon energy for wide optical transparency, which ar...
Article
We analyze a chip-to-chip optical interconnect platform based on our recently developed flexible substrate integration technology. We show that the architecture achieves high bandwidth density (100 Tbs/cm2), and does not require optical alignment during packaging. These advantages make the flexible photonics platform a promising solution for chip-t...
Conference Paper
We experimentally demonstrated for the first time on-chip cavity-enhanced mid-infrared spectroscopic sensing of chemical molecules, performed near 5.2 μm wavelength using Ge23Sb7S70 resonators monolithically fabricated on CaF2 substrates.
Article
Full-text available
Planar optical structures based on functionalized chalcogenide glasses provide a superb device platform for chemical and biological sensing applications. Chalcogenide glasses have demonstrated promise as materials for infrared sensing as they exhibit transparency over a large range of infrared wavelengths and tunable optical properties through dopi...
Conference Paper
Full-text available
Here we show our ability to fabricate two-dimensional (2D) gratings on chalcogenide glasses with peak-to-valley amplitude of ~200 nm. The fabrication method relies on the thermal nano-imprinting of the glass substrate or film in direct contact with a patterned stamp. Stamping experiments are carried out using a bench-top precision glass-molding mac...
Article
Full-text available
We have demonstrated what we believe to be the first waveguide photonic crystal cavity operating in the mid-infrared. The devices were fabricated from Ge<sub>23</sub>Sb<sub>7</sub>S<sub>70</sub> chalcogenide glass (ChG) on CaF<sub>2</sub> substrates by combing photolithographic patterning and focused ion beam milling. The waveguide-coupled cavities...
Conference Paper
Full-text available
We demonstrated thermal nanoimprint fabrication of photonic devices in chalcogenide glass films on both semiconductor and nonconventional plastic substrates. A high micro-ring intrinsic quality factor of 3 × 105 is achieved at 1550 nm wavelength.
Conference Paper
We demonstrated thermal nanoimprint fabrication of low loss waveguides and micro-ring resonators in thermally evaporated and solution processed chalcogenide glass films. A high micro-ring quality factor of 75,000 is achieved at 1550 nm wavelength.
Conference Paper
We demonstrate monolithic fabrication of 3-D photonic structures on flexible substrates. Strain-optical coupling behavior of the flexible devices is quantified through in-situ optical measurements and is successfully accounted for using nanomechanical finite element analysis.
Conference Paper
We fabricated and characterized high-index-contrast As2Se3 micro-disk resonators on silicon with a record loaded Q-factor of 105 at 5.2 μm wavelength. On-chip chemical sensing using cavity-enhanced infrared spectroscopy was demonstrated using the micro-disk device.
Conference Paper
We fabricated and characterized high-index-contrast As2Se3 micro-disk resonators on silicon with a record loaded Q-factor of 105 at 5.2 μm wavelength. On-chip chemical sensing using cavity-enhanced infrared spectroscopy was demonstrated using the micro-disk device.
Article
Full-text available
We demonstrated high-index-contrast, waveguide-coupled As<sub>2</sub>Se<sub>3</sub> chalcogenide glass resonators monolithically integrated on silicon fabricated using optical lithography and a lift-off process. The resonators exhibited a high intrinsic quality factor of 2×10<sup>5</sup> at 5.2 μm wavelength, which is among the highest values repor...
Article
Full-text available
Chalcogenide glasses, namely the amorphous compounds containing sulfur, selenium, and/or tellurium, have emerged as a promising material candidate for integrated photonics given their wide infrared transparency window, low processing temperature, almost infinite capacity for composition alloying, as well as high linear and nonlinear indices. Here w...
Article
Full-text available
Chalcogenide glasses have been widely studied due to their extraordinary transparency in the mid-infrared region. Their transparency, combined with tailorable thermo-mechanical properties, makes them ideal candidates for various optic applications. Extrinsic impurities within the glass matrix can impede their integration in components where low opt...